Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51446190072839f…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 10:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b420bd73a33383d75b11cda4ddb0550c SHA-1: eca02e469636f400790cc53c516abfcb0500c140 SHA-256: d51446190072839fef1740c5e90ab20aa551a20465e4994d53d9e17ffdf14797
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains malformed streams and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It embeds multiple URLs, including one that appears to be a link farm on disposable hosting, and another that directly links to a suspicious domain ('lozipotod.ru'). The document body, though heavily obfuscated, contains text related to a poem, suggesting a lure to disguise the malicious intent. The presence of malformed exploit streams indicates an attempt to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=what+is+the+setting+of+the+highwayman+poem PDF link annotation
    • http://nijibegosovatiz.iblogger.org/select_city_walk_store_guide.pdfIn PDF document text
    • http://nofovukad.iblogger.org/xugew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_d504d13f994e4258a1a3d2fd0637844e.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_8d85fa48b1934f17b54e22c9cb8fc715.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee4f4c9-c8ba-4347-a3ed-7a0eedb53fd2/xinutonidozivugijugukap.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/vipamazolejumefidefipa.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/ambiano_coffee_capsule_machine_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/non_conformance_report_in_food_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/quest_guide_vanilla_wow_horde.pdfIn PDF document text
    • http://pitodisile.epizy.com/nalamunowave.pdfIn PDF document text
    • http://patazave.epizy.com/jidatewuvumapejaxigo.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_ebc88b0efd5941cda734965a93e20543.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/208534f5-8601-4bad-8172-5e6125500bac/winter_reading_passages_5th_grade.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_b738a258a1f842a29c72dbe02a92d73b.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_5ce07ac3ca6946869870cb154473ce49.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_6a8eb209ca8941acaa99bbc5e2aca992.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulazelof/restaurant_operations_manager_responsibilities.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 5392 bytes
SHA-256: 40f65b1f7fe9253db09b71377f2fa336a4facc9a426f373e477cad661a6246d7
font_01_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10844 bytes
SHA-256: 1e343478f600f22f0f3431a1fb05d8f3775b0686c6a4897799bb31a262d798f4

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